Which of the following is thermoplastic ?

Options

A. Dacron
B. Nylon
C. Polythene
D. All of these

Answer

To determine which of the following materials is a thermoplastic, let's analyze the options provided: Dacron, Nylon, and Polythene.

### Step-by-Step Solution:

1. **Understanding Thermoplastics**:
- Thermoplastics are materials that can be melted and reshaped multiple times without undergoing any significant chemical change. When heated, they soften and when cooled, they harden again.

2. **Analyzing the Options**:
- **Dacron**: This is a type of polyester that is known for its durability and is indeed a thermoplastic.
- **Nylon**: This is a synthetic polymer and is also classified as a thermoplastic due to its ability to be melted and reshaped.
- **Polythene (Polyethylene)**: This is a common thermoplastic used in various applications, known for its flexibility and resistance to moisture.

3. **Conclusion**:
- Since all three materials (Dacron, Nylon, and Polythene) are thermoplastics, the correct answer to the question is that all of these options are thermoplastics.

### Final Answer:
- The correct answer is **D) All of these**.